Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nome da moeda para dívida negociável sendo 1300.
 ###Tabelas: CREATE TABLE main_issuers (main_issuers_id AUTO_INCREMENT PRIMARY KEY, Currency VARCHAR, Country VARCHAR, Generic Name or Nickname VARCHAR, Rating ( S&P / Moodys ) VARCHAR, Negotiable debt at mid-2005 ( US dollar bn equivalent) INT, Government financial liabilities as % of GDP (end 2003 - source : OECD ) VARCHAR, Issuer VARCHAR, Internet site VARCHAR) CREATE TABLE students (students_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, 1997 INT, 1998 INT, 1999 INT, 2000 INT, 2001 INT, 2002 INT, 2003 INT, 2004 INT, 2005 INT, 2006 INT, 2007 INT, 2008 INT, 2009 INT, 2010 INT, 2011 INT, 2012 INT, Total INT) CREATE TABLE elementary_schools_grades_k-6 (elementary_schools_grades_k-6_id AUTO_INCREMENT PRIMARY KEY, Elementary Schools VARCHAR, Mascot VARCHAR, Address VARCHAR, Principal (2013-2014) VARCHAR, Assistant Principal (2013-2014) VARCHAR) CREATE TABLE non-championship_grands_prix (non-championship_grands_prix_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Circuit VARCHAR, Date VARCHAR, Winning driver VARCHAR, Winning constructor VARCHAR, Report VARCHAR) CREATE TABLE all-time_statistics (all-time_statistics_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Nationality VARCHAR, Position VARCHAR, Sky Blue FC career VARCHAR, Appearances INT, Starts INT, Minutes INT, Goals INT, Assists INT)  
SELECT Currency FROM main_issuers WHERE Negotiable debt at mid-2005 ( US dollar bn equivalent) = 1300